Hey guys! We're building a platform to enable competitive gaming for bitcoin, and the first game we are supporting is League of Legends. It's at leetcoin.com.
Basically, let's say you and a friend, or your team and another team, want to play each other for money. Our system lets you both put money on the table, and the winner is automatically paid out at the end of the game. You can play for any amount you want, pennies to hundreds of dollars. (Although we are limiting the maximum to around $40 since we are still in beta)
Our system is in beta right now, so if you have any questions just contact us. Our site has an FAQ, and when you log in there is a user guide.